Special Section on Nanoplasmonics

Bowtie nanoantennas with symmetry breaking

[+] Author Affiliations
Ji Chen

Peking University, School of Electronic and Computer Engineering, Shenzhen 518055, China

Zhaoyu Zhang

Peking University, School of Electronic and Computer Engineering, Shenzhen 518055, China

J. Nanophoton. 9(1), 093798 (Dec 22, 2014). doi:10.1117/1.JNP.9.093798
History: Received October 9, 2014; Accepted November 25, 2014
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Abstract.  Surface plasmon resonances of optical bowtie nanoantennas with symmetry breaking are studied numerically using the finite-element method. Beginning with both x-axial and y-axial symmetry, bowtie structures are reshaped by varying two parameters (edge lengths and bow angles) to create various symmetries to achieve controllable resonant modes and gap enhancement in the visible and infrared wavelength range. The four edges’ coupling is the main factor contributing to the final fundamental resonances. Double fundamental resonances can be achieved in bowtie structures with x-axial or y-axial symmetry. These properties can guide both the engineering and the fabrication of plasmonic nanoantennas.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Ji Chen and Zhaoyu Zhang
"Bowtie nanoantennas with symmetry breaking", J. Nanophoton. 9(1), 093798 (Dec 22, 2014). ; http://dx.doi.org/10.1117/1.JNP.9.093798


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